Completing the Convergence: Reliable Fax over your VoIP Network Bud Walder Enterprise Marketing Director [email protected]

Completing the Convergence:

Reliable Fax over your VoIP Network

Bud WalderEnterprise Marketing Director

[email protected]

© Copyright 2010 Dialogic Corporation. All rights reserved.SLIDE 2

Who is Dialogic Why is Fax Relevant in This Century Fax Market Drivers Faxing over IP Networks

– T.30 Pass-Through vs. T.38 Fax-Relay FoIP over SIP Trunks: Deployment Scenarios

Agenda


Dialogic Highlights

Dialogic and Veraz Networks completed merger October 1, 2010

Listed on NASDAQ (DLGC)

Annualized revenue greater than $250M1

Leading portfolio of IP and TDM based multimedia processing and call control enabling technologies and products

World class service and support (24/7)

Deployed:– In High-Value Solutions that are in use by over 2 Billion

Mobile Subscribers– In Network Infrastructure that carries over 5 Billion minutes

of traffic per month– In 80% of Fortune 2000 companies

70+ issued US patents– Approximately 60 patent pending applications worldwide– Approximately 25 issued foreign patents

1 Following the merger and subsequent integration of the two companies and after excluding adjustments to revenue under purchase accounting rules

The leading enabler for unleashing profit from

video, voice and data for advanced networks


Rich Heritage of M&A


Bandwidth Optimization VoIP / FoIP Gateways

Bandwidth Optimization VoIP / FoIP Gateways

Broad Multimedia Processing and Call Control InfrastructureProduct Portfolio

Call Control InfrastructureCall Control

Infrastructure

Multimedia Processing

Infrastructure

Multimedia Processing

Infrastructure

Session Border ControllerSession Border ControllerWireless Backhaul

Bandwidth Optimization

Wireless Backhaul Bandwidth Optimization

SoftswitchSoftswitch

VideoGateways

VideoGateways

Multimedia Processing Server Platforms

Multimedia Processing Server Platforms

SignalingSignaling

ServicesServicesServicesServices

Video ProcessingServer Software

Video ProcessingServer Software

• Dialogic® PowerMedia™ (HMP, IPMS and WMS) Server Software• Dialogic® Media and Network Interface Boards (HMP interface series of

boards, DM3 series, CG series, JCT series, Diva ®series, and Brooktrout® series)

• Dialogic®CSP and MSP platform

• Dialogic® BorderNet™, IMG, and DMG series of service provider and enterprise gateways

• Dialogic I-Gate® 4000 and DTX-600 series• Dialogic I-Gate® 4000 Session Bandwidth Optimizer Core

• Dialogic® PowerMedia™ Server Software

• Dialogic® Brooktrout® Fax Software

• Dialogic® ActionLine™ and Dialogic® Pro™ Services annuity support, installation and professional services

• Dialogic® Vision™ 1000 Video GW

• Dialogic I-Gate® 4000 Session Bandwidth Optimizer Backhaul

• Dialogic® DSI Signaling Servers• Dialogic® TX and DSI Series of

boards and software

• Dialogic® BorderNet™ 3000 SBC

• Dialogic® ControlSwitch™ Softswitch

Market Drivers:

The Relevancy of Fax in the 21st Century


Fax Servers– Document Management & Workflow– Production Fax & Productivity Enhancement– Compliance & Multi-Function Peripheral Integration

Fax as “table stakes” for participation in Unified Communications Market Segment– OCS

Migration to Fax over IP (FoIP)

Why is Fax Still Relevant in This Century?


Corporate networks moving to VoIP

Adoption of multi-functional peripherals (MFPs)

Regulatory compliance

Technology upgrades & interest in UM/UC

Server virtualization

What’s Driving Fax Sales Today?

Faxing over IP Networks

Pass-Through vs.

T.38 Fax-Relay


Traditional Faxing is based on the T.30 Protocol– T.30 was designed for a network with relatively smooth and

uninterrupted data flows.– T.30 is an audio protocol. The sending and receiving fax machines are

listening to the tones generated by the other machine. If tones are distorted, then the fax image will not be transmitted correctly.

Traditional Faxing vs. Fax Over IP (FoIP)


As mentioned in the previous slide, T.30 was designed for a network with relatively smooth and uninterrupted data flows

This is the opposite of the way an IP network was designed to operate. In other words the T.30 fax protocol was not created to tolerate the latency, jitter, and packet loss that are inherent in an IP network.

The audio compression that takes place on a VoIP network may not affect a Voice call but can severely affect a Fax call.

Why T.30 Fax Doesn’t Work Reliably on a VoIP Network


Do Nothing– Attach your fax machines to your VoIP Network and live with the

80%-90% single page success rate that is achievable this way.– However, realize that the chance of a failed transmission is

exponential as the number of pages increases. At 80% single page success rate

1 Page Fax - 0.81 – 80% Document Success Rate2 Page Fax – 0.82 – 64% Document Success Rate20 Page Fax – 0.820 – 0.922% Document Success Rate55 Page Fax – 0.855 – 0.000% Document Success Rate

How (NOT) to get a fax over an IP Network


A simple technique for creating a “fax friendly" environment on a VoIP network.

Makes very little distinction between voice calls and fax calls. Also called Voice Band Data (VBD) by the ITU, it refers to the

transport of fax or modem signals over a voice channel through a packet network with an encoding appropriate for fax or modem signals. – G.711 (u-law or a-law)– Voice Activity Detection (VAD) off– Echo Cancelation (EC) off

Faxing over an IP Network Option 1: Fax Pass-Through


Two Techniques– Dedicated Fax Trunks

• All ATAs, IADs, and gateways to be permanently locked at G.711 with VAD and EC disabled

• Easy to manage but the cost is the loss of the having a dedicated fax trunk• More expensive• Severely restricts the ability of telecom administrators to take advantage of any

trunk sharing capabilities available with the PBX or IP-PBX in their infrastructure.– Dynamically Configured Fax Trunks

• Gateways that are able to distinguish between a voice call and a fax call in real time by detecting the V.21 preamble, which is part of all fax calls. Once this preamble is detected, the gateway automatically switches to Fax Pass-Through mode

– David Haynes and Gonzalo Salguiero, Fax, Modem, and Text for IP Telephony (Cisco Press, 2008)

Establishing a Fax Pass-Through Session


Breaks down the T.30 fax tones into their HDLC frames (known as demodulation) before sending the fax information through the network.

This information is sent across the voice network using the T.38 Fax Relay protocol, and is then converted back into T.30 fax tones at the endpoint (known as modulation).

The fax machines on either end are sending and receiving tones and are not aware that any demodulation or modulation is occurring.

Uses a variety of techniques to keep the T.30 session communication between two T.30 endpoints from failing even when significant delay, jitter, and packet-loss occur.

Faxing over an IP Network Option 2: T.38 ‘Fax Relay’


T.30 Fax Pass-Through– G.711 (u-law or a-law)– Voice Activity Detection (VAD) off– Echo Cancelation (EC) off– Move the audio (fax tones) through the network with as little

distortion as possible T.38 Fax Relay

– Demodulate the tones as close to the sending machine as possible.– Remodulate the tones as close to the receiving machine as possible

Fax Pass-Through vs. T.38 Fax Relay


How do these two methods hold up in the face of Delay, Packet Loss and Jitter?

Fax Pass-Through vs. T.38 Fax Relay (con’t)


Effects of Delay, Packet Loss and Jitter on FoIP

The packet-based networks performancerequirements for real-time facsimile transmission

- Tomaz Aljaz, Bohan Imperl, Urban Mrak, December 2006


The effects of fixed delay were nominal on both image quality and success rate.

The test page was sent successfully (nearly 100% success rate) in both pass-through and relay mode with no image distortion.

Increase in delay did result in measurably longer transmission times (as much as 15% longer transmission times with 500ms of network delay).

Delay increased transmission time more significantly in Relay Mode than it did in Pass-Through Mode.

Effects of Delay on FoIP


Jitter has no effect when sending faxes via T.38 Fax Relay

“It was not possible to recreate a network condition in the testing environment that the T.38 protocol, in redundant or non-redundant mode, could not have

coped with.”

- Toma Aljaz, Boyan Imperl, and Urban Mrak, “The packet-based networks performance requirements for real-time facsimile transmission,” Computer Communications, Volume 30, Number 6, pp 1289-1300

(March 2007)

Effects of Jitter on FoIP – T.38 Fax Relay


Jitter has significant negative impact on Fax Pass-Through– With a nominal delay of 60 ms and the maximum length of the jitter buffer set to

100 ms, the success rate for faxes sent using Fax Pass-Through fell to below 80% with delay variance of as little as 17 ms in some configurations.

– Other configurations did stay at about an 80% success rate until the variance reached 25 ms.

– The amount of Variance is more significant the degree of Variance.

Success rate in Pass-Through mode increased when the maximum size of the jitter was set equal to the expected nominal delay. Increasing the maximum

length of the jitter buffer to match the nominal delay had a negative effect on the quality of the voice conversations carried over the converged network.

Effects of Jitter on FoIP – Fax Pass-Through


In all cases except T.38 in Redundant mode, just 1% packet loss caused 20% single-page failure rate

In T.38R Mode, single-page Success Rate stayed above 80% until packet loss exceed 4%

Caveat:Even in T.38R mode, bursty packet loss in which more than 10

packets in a row are lost, will significantly impact the success rate mode

Effects of Packet Loss on FoIP


IP Network IssueT.30 Pass-Through

Success ratesT.38 Fax Relay Success Rates

Delay Minimal Impact Minimal Impact

Jitter Significant Impact Minimal Impact

Packet Loss Significant Impact Minor Impact

Effects of Delay, Packet Loss and Jitter on FoIP - Summary


At 80% Single Page Success rate:– A fax document of more than 20 pages has less than a

1% chance of success. – A 55 Page Fax statistically cannot be delivered

successfully.

T.38 Fax Relay must be implemented throughout the network to meet the needs of the Market Place.

In Addition, a T.38 call uses 20% of the amount of bandwidth needed for Fax Pass-Through. Fax Relay is a T.38 fax transmission that uses

a stream of bits running at an average speed of 14,400 bps. Fax Pass-Through is a G.711 stream of audio samples running at

64,000 bps. Using Fax Relay can result in a bandwidth savings of 80% over Fax Pass-Through.

Conclusion: T.38 = Reliable FoIP

FoIP over SIP Trunks:Deployment Issues


Deployment Scenarios

– Fax Server + PBX / PSTN

– FoIP Server + T.38 Gateway + PSTN Service

– FoIP Server + T.38 IP-PBX + PSTN Service

– FoIP Server + SBC / Gateway + T.38 enabled SIP Trunk Service

– Fax Server (TDM) + T.38 Gateway + SIP Trunk

Deploying Fax and FoIP


Fax Server Fax Machine

image conversion engine

T.30 protocol T.30 protocol

PSTN interface

T.30 data

Desktop Fax Application

PSTN interface


64 kbps bandwidth

T.30

Circuit-Switched Faxing

T.30

PSTN


FoIP Gateway


T.30 protocol

T.38 end point protocol

T.30 protocol

PSTN interfaceIP network interface PSTNIP

T.38 datamuch lessbandwidth

T.30 dataT.38 fax relay protocol

FoIPServer Traditional Fax Machine


PSTNimage conversion engine

Faxing with a FoIP gateway

T.30

T.38

PBX


IP-PBX


T.30 protocol

T.38 end point protocol

T.30 protocol

PSTN interfaceIP network interface PSTNIP

T.38 datamuch lessbandwidth

T.30 dataT.38 fax relay protocol

FoIPServer Traditional Fax Machine


PSTN


FoIP with an Interoperable IP-PBX

T.30T.38


SIP Interop

SIP QoS Demarcation

SIP Security

TDM / PSTN Gateway

Firewall / NAT Traversal

Fax / FoIP Gateway

FoIP with an Interoperable SBC and SIP Trunk Service

•IP-PBX

•FoIP Server

IP-PhoneIP Soft-Phone

ATA / FXS Gateway

Fax Machine

POTs Phone

ITSPISP PSTN Fax Machine

SIP Trunk Service w/ T.38 Support Broadband

Internet Service

Dialogic® BorderNet™ 500 Gateway w/ Session Border Control

* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

PSTN Failover / Alternate Route


SIP Trunk Service w/ T.38 Support

SIP Interop

SIP QoS Demarcation

SIP Security

TDM / PSTN Gateway

Firewall / NAT Traversal

Fax / FoIP Gateway

Faxing with an Interoperable SBC / Gateway and SIP Trunk Service

ITSPISP PSTN

•Fax Servers

Legacy PBX (non-SIP)

POTs Phone

Fax Machine

Digital Phone

Broadband Internet Service

BorderNet 500 Gateway w/ Session Border Control

Optional PBX / PSTN Gateway Connectivity Support

* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

Corporate LAN / WAN

Fax Machine


Dialogic® Brooktrout® TR1034 Fax BoardsDialogic® Brooktrout® SR140 Fax SoftwareDialogic® Host Media Processing (HMP) Software Dialogic® IP Media ServerDialogic ® Integrated Media Gateways Dialogic® Media Gateway SeriesDialogic® BorderNet™ 500 Gateways

Dialogic® Products that Support T.38


Dialogic Enables our Partners to Create Innovative Applications in a Timely Manner, and is Investing to grow its position as the #1 Open Systems provider for the Converged Communication Market segment

– Engineering– Sales and Marketing– Unrivaled Ecosystem of Partners

Dialogic and our Products are there for you so you can Deliver your Solution to Market

– Global Experience and Presence– World Class Service And Support (24x7)– Building Blocks At All Levels For Service Providers And

Enterprise– Product Reliability and Delivery

Why Choose Dialogic?


Fax is Still Relevant Today TDM solution are giving way to FoIP solutions

– There are both benefits and pitfalls to be aware of when moving to an FoIP solution

There are many options when implementing an FoIP Solution– Internal Hardware– Software Only Solutions– Gateways and Appliances– Virtualized Solutions– SIP Trunking– Hosted Solutions

Wrap Up


Dialogic, Dialogic Pro, Brooktrout, Diva, Diva ISDN, Making Innovation Thrive, Video is the New Voice, Diastar, Cantata, TruFax, SwitchKit, SnowShore, Eicon, Eicon Networks, NMS Communications, NMS (stylized), Eiconcard, SIPcontrol, TrustedVideo, Exnet, EXS, Connecting to Growth, Fusion, Vision, PacketMedia, NaturalAccess, NaturalCallControl, NaturalConference, NaturalFax and Shiva, among others as well as related logos, are either registered trademarks or trademarks of Dialogic Corporation or its subsidiaries (“Dialogic”). The names of actual companies and products mentioned herein are the trademarks of their respective owners. Dialogic encourages all users of its products to procure all necessary intellectual property licenses required to implement their concepts or applications, which licenses may vary from country to country. Dialogic may make changes to specifications, product descriptions, and plans at any time, without notice.

This document discusses one or more open source products, systems and/or releases. Dialogic is not responsible for your decision to use open source in connection with Dialogic products (including without limitation those referred to herein), nor is Dialogic responsible for any present or future effects such usage might have, including without limitation effects on your products, your business, or your intellectual property rights.

USE CASE(S)Any use case(s) shown and/or described herein represent one or more examples of the various ways, scenarios or environments in which Dialogic products can be used. Such use case(s) are non-limiting and do not represent recommendations of Dialogic as to whether or how to use Dialogic products.

06/10

Completing the Convergence:

Reliable Fax over your VoIP Network

Jeff [email protected]://twitter.com/diastar

http://facebook.com/jeffreygdworkin

Q & A


VoIP = Voice over IP Why Put Voice on an IP Network?

– Convergence reduces operating expense – Using VoIP reduces telephony costs

Other VoIP Drivers – End-user productivity – PBX providers driving upgrades (e.g., Cisco, Avaya)

VoIP Deployments Drive the Need for FoIP– As part of the migration to VoIP, enterprises need to move their fax

infrastructure to IP

Driver : Enterprise Adoption of VoIP


MFP = multi-function peripheral Enables consolidation & centralization of Fax infrastructure

– Easier to manage a single shared resource – Elimination of Fax machines and associated costs

Sales of MFPs will grow 24% by 2010 (IDC) MFPs Drive Growth of Fax Servers

– MFP related fax server sales projected to grow 25% CAGR through 2011 (Davidson)

Adoption of MFPs creates demand for IP-based Fax

Driver : Continued Adoption of MFPs


Compliance regulations– E.g. Sarbanes-Oxley, HIPAA, USA Patriot Act– Forces businesses to track all messages and paper transactions,

retrieve them, and to secure them confidentially– Personal liability of directors

Drives increased use of MFPs and Fax Servers

Driver : Compliance Regulations


Driver: Technology Upgrades

Upgrades of Servers – OS upgrades can drive server changes– PCI, PCI-X to PCI-Express issues– Boards to board-less IP-based technology– Easy opportunity to introduce/sell FoIP

Upgrades of PBXs – Depending on vendor, IP migration may require an all-

IP solution including Fax– A natural opportunity to introduce/sell FoIP


Driver: Server Virtualization

Virtual server technology (e.g. VMware, virtual server or Hyper-V) support multiple PC images running on one physical PC.

Fax boards are not supported in virtual servers so all-software solutions are required – FoIP is the answer.

This is also important for business continuity and disaster recovery plans.


Even though solution may exist as “Software Only” that does not guarantee that they can be virtualized.

You still may need a Dedicated Server for each instance of the software

Software Only Solution vs. Virtualization

Fax Server #1 Fax Server #2 CRM Server #1 CRM Server #2



Fax Server #1 Fax Server #2 CRM Server #1 CRM Server #2

Virtual Server #1

Virtual Server #2


Now you only have two servers– Each one is running both applications

• Fax Server• CRM Server

Real Virtualization Real Redundancy


Virtual Server #1

Virtual Server #2


Latency is the amount of time it takes for a sound uttered at one end of a conversation to arrive at the ear of the distant end of the conversation.

Delay (or Fixed Delay) is that part of Latency that is a result of the physical configuration and/or design of the system– Processor Speed to Packetize– Distance the Packets have to travel– Processor Speed to DePacketize

It is defined in a Perfect World

Delay


Jitter is the Variable portion of Latency caused by the randomness of the World in general and the IP Network in particular– Load on the processor doing the packetization– Network Traffic– Routing Errors– Load on the processor doing the depacketization

In a VoIP Implementation this variability is managed using a Jitter Buffer

Jitter


Packet loss occurs when one or more packets of data traveling across a computer network fail to reach their destination.

Packet loss can be caused by a number of factors– Signal degradation over the network medium– Oversaturated network links – Corrupted packets rejected in-transit – Faulty networking hardware – Maligned system drivers or network applications– Normal routing routines

Packet Loss


FoIP Server + Media Gateway: Example Use Cases*

– Enables FoIP Server in TDM and Hybrid PBX Environment– Enables Fax Server to be Deployed as a Virtual Server– Enables Centralized Fax Servers for Multi-Site Organizations

PSTN

Dialogic® Brooktrout® SR140 Fax Software-based Fax Server

PBX

Dialogic® 2000 Media Gateway Series

T.38 FoIPT.30 Fax

PBX

Remote SiteWAN* - Please refer to ‘USE CASE(S)’ portion of the

Legal Notice on the last slide


Appliance use in a VoIP/FoIP Implementation

PSTNIP Network

Firewall

Broadband Internet Access

IP Telephony Service Provider

IP PBX / Contact Center

PSTN-VoIP

Gateway

Corporate Voice and Data LAN

VirtualizedFax Server


Fax documents are moved through the corporate WAN rather than into the PSTN or to the ITSP, reducing long distance telephony costs

Using Centralized Servers (with Appliances at the edge) to reduce capital and operational expenses

Appliances are easy to install and may be remotely configured, reducing associated time and expense while still being able to increase the capacity of the implementation as needed

Appliances enhance reliability, redundancy and survivability

Benefits Offered by using Appliances


SIP Trunking in a VoIP/FoIP Implementation

PSTNIP Network

Firewall




PSTN-VoIP

Gateway



PSTN-VoIP

Gateway


By maintaining only a single data network, rather than a voice network, SIP Trunking can reduce capital and operational expenses

Without a connection to the PSTN, business operations can be streamlined with fewer vendors to deal with

Interoperability and Gateway maintenance are handled by the carrier rather than the enterprise, reducing operational complexity and expenses

Benefits Offered by using SIP Trunking


Hosted Services in a VoIP/FoIP Implementation

PSTN

Firewall






IP Network


PSTN-VoIP

Gateway


Effectively manage Overflow or Unexpected Spikes in usage Minimize Capital Outlay and Potential Obsolescence Issues Remove geographic limitation of a CPE based solution Disaster Recovery Business Continuity

Benefits Offered by using Hosted Fax Services


The Marketing for Individual Fax Machines in Shrinking But the Fax Server Marketing is actually Growing

– “The Fax over IP Fax Server segment is expected to show a Compounded Annual Growth Rate (CAGR) of 39.2% through 2011 and be worth $340 million.”

– Davidson Consulting, Computer-Based Fax Marketing, 2006-2011 (December 2007)

Fax is NOT Going Away


[Aljaz] Toma Aljaz, Boyan Imperl, and Urban Mrak, “The packet-based networks performance requirements for real-time facsimile transmission,” Computer Communications, Volume 30, Number 6, pp 1289-1300 (March 2007)

[Davidson] Davidson Consulting, Computer-Based Fax Marketing, 2006-2011 (December 2007)

[Haynes] David Haynes and Gonzalo Salguiero, Fax, Modem, and Text for IP Telephony (Cisco Press, 2008)

References

Documents

Completing the Convergence: Reliable Fax over your VoIP Network Bud Walder Enterprise Marketing Director [email protected]